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We measure the defect density as a function of time at different temperaturesin simulations of a two dimensional system of interacting particles. Just abovethe solid to liquid transition temperature, the power spectrum of the defectfluctuations shows a 1/f signature, which crosses over to a white noisesignature at higher temperatures. When 1/f noise is present, the 5-7 defectspredominately form string like structures, and the particle trajectories show a1D correlated motion that follows the defect strings. At higher temperaturesthis heterogeneous motion is lost. We demonstrate this heterogeneity both insystems interacting with a short ranged screened Coulomb interaction, as wellas in systems with a long range logarithmic interaction between the particles.Comment: 4 pages, 5 postscript figure

Fluctuating Topological Defects in 2D Liquids: Heterogeneous Motion and Noise